"04-13-15: Mofimadness
To add to Tom's comments above, the OP never asked about a tool. He asked how to set the VTA of the arm. I bet he already has the wrench. He justed needed to know how to raise and lower the arm post."
Yes, but if you look at the pics carefully, you'll see that they use tamper proof bolts on the vta adjustment. If you don't loosen them there's no way to set vta. You need special sockets. They sell them in Lowes, and they're not expensive.